Ni_0.6Fe_0.4Se₂/rGO Heterogenous Nanocubes Anode for Stable and Efficient Na/K‐Ion Storage

Abstract

specific capacity owing to their volume expansion during discharge/charge process. [13] Previous studies have demonstrated that the surface of the selenides can be covered with carbon materials to improve electrochemical property. Li et al. [14] reported the preparation of FeSe carbon composite materials by selenization of Prussian blue analogue (PBs) in N-doped porous carbon. The composite shows the superiority in structure, which can provide an effective channel for charge transfer. Besides, the bimetallic synergistic effect is also one of the effective ways to optimize the electrochemical property of the composite materials. Especially, the bimetallic heterogeneous interface can accelerate the diffusion rate of ions (Na + /K + ) and increase the pseudocapacitance of the electrode material. For example, Li et al. [15] prepared the NiCo 2 Se 4 /N-doped porous carbon nanocubes (NiCo 2 Se 4 @NPC) by derived bimetallic Ni/Co-ZIF-67. The NiCo 2 Se 4 @NPC nanocubes can provide a specific discharge capacity of 462.1 mAh g −1 at 0.1 A g −1 , and even at 2.0 A g −1 , the discharge capacity of the nanoparticles can reach 372 mAh g −1 for SIBs. Ge et al. [16] had investigated multiple metal elements (Co, Ni, Mn) doped PBs structure. Among them, the binary Ni 0.67 Fe 0.33 Se 2 can maintain the ultralong-term stability of 375 mAh g −1 even at 10.0 A g −1 after 10 000 cycles. Furthermore, the heterostructured bimetallic sulfides can inherit the synergistic advantage and the heterointerface advantage, which can offer rich chemical sites for reduction-oxidation of Na + /K + , thereby showing enhanced sodium/potassium storage performance. [17] However, the sluggish reaction kinetics and poor cycling stability of metallic compound of sulfur and selenium have hampered its development as anode for high-performance for SIBs/PIBs. Zhang et al. used the method of combining selenide and 1D carbon nanotubes (CNTs) or 3D carbon framework with high conductivity to solve the problems of slow charge transfer and poor stability during the process of sodium ion (potassium ion) insertion and extraction. [17][18][19] However, it is still urgently necessary to obtain composite anode materials with all the above-mentioned excellent characteristics for SIBs/PIBs. [22,23] Herein, Ni 0.6 Fe 0.4 Se 2 /rGO (NFSG) composite material was synthesized by easy selenization of NiFePBs/rGO (precursor abbreviated as NFG), which was prepared by in situ growth of bimetallic (Ni and Fe) Prussian blue (NiFePBs) on the rGO by one-step hydrothermal method. First, transition metal selenides have been reported to have high specific capacity and Rational design of electrode materials with cycle stability and high reversible capacity is crucial to the commercial applications of sodium/potassium ion batteries (SIBs/PIBs) in the future. Developing a high-efficiency anode for SIBs and PIBs, which is formed from the heterogenous Ni-Fe bimetallic nanocube composite selenide grown on graphene (Ni 0.6 Fe 0.4 Se 2 /rGO, abbreviated as NFSG). The Ni 0.6 Fe 0.4 Se 2 nanocubes o...

Architectural design of anode materials for superior alkali-ion (Li/Na/K) batteries storage

“…The exploration of two-dimensional (2D) materials in rechargeable batteries has received great attention as promising anode materials owing to, the capability of higher charging rates and their high surface area by metal ions 58 , 59 . Therefore, developing anode materials with excellent comprehensive electrochemical performance and low cost is crucial for the wide-scale practical application of SIBs/PIBs 60 . MXenes, also recognized as 2D transition metal carbides, are becoming increasingly promising for the storage of sodium ions.…”

Reduced Graphene Oxide Modulated FeSe/C Anode Materials for High‐Stable and Long‐Life Potassium‐Ion Batteries

“…Additionally, engineering selenide heterojunctions allows tuning the electrodes' electronic structure and ion transport properties, enhancing cycling stability and reaction kinetics in batteries. [20][21] Another approach involves incorporating carbon layers onto selenide materials to improve metal selenides' structural stability and electrical conductivity, including active carbon, [22][23] graphite, [24][25][26] and doped carbon. [27][28] Notably, rGO provides significant advantages in enhancing the electrode's performance, allowing for faster ion and electron transport kinetics and more active sites for electrochemical activities.…”